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What it says is that if you set FesLastFunctionInterval to 15min it will revert to the last setting when restarted within that timeframe.

Furthermore in FesInitMode you should be able to set the value to 255 to always revert to the last setting. However when I edit that value and enter 255 it always changes to 0255 and Unknown as the Word.

The 15min setting doesn't seem to work either.
Will do some further testing after letting the car sit for a while, maybe someone else has had more success?

Just a heads up. I tested these two codes in the BDC_Body folder on someone's F15 and it did nothing in all 4 different configurations. Then, today, I found out that FESINITMODE and FESLASTFUNCTIONINTERVAL also exist in in the ICM folder....GO FIGURE! Make sure you guys test it in these folders too. Maybe, BDC_Body is not needed at all and only ICM is needed to be changed. Let me know if you guys find anything. Thank you!